When New magento 1.9.1 Relase it came with new features and Security flow.But why "Mobile Menu" had been Removed from Magneto 1.9.1 new version ?
Does New "Magento 2" verison will coming up with new more fatures Related to mobile?
The 'Mobile' menu was only used for the mobile app service that Magento provided a few years ago. That service hasn't been offerred for a while, so the menu was removed in a recent update.
If you're looking for mobile features, though, 1.9 has them! In 1.9 the focus is on making it easier to build a fully responsive site in Magento that looks great on mobile, tablet and desktop devices.
https://magento.com/blog/magento-news/magento-community-edition-191-now-available-download and http://www.magentocommerce.com/knowledge-base/entry/ce19-later-release-notes are both great resources for the Magento 1.9.1 changes and new features.
You need to enable the XML Connect Module in app/etc/modules/Mage_XmlConnect.xml by changing
Make sure that the Mage_XmlConnect module is enabled. I believe it's disabled by default on Magento CE 1.9.1. To check, open app/etc/modules/Mage_XmlConnect.xml and look at the <active></active> tag. If it says false, change it to true. Magento 2 active mobile menu.